﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var sql = "select * from Students";
            var dt = DBHelper.GetDataTable(sql);
            dataGridView1.DataSource = dt;

            dataGridView1.ReadOnly = true;
            dataGridView1.AllowUserToAddRows = false;
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
        }
        private void button1_Click(object sender, EventArgs e)
        {//添加
           Form2 form2 = new Form2();
            var res = Form2.ShowDialog();
            if (res == DialogResult.Yes)
            {
                var sql = "select * from Students";
                var dt = DBHelper.GetDataTable(sql);
                dataGridView1.DataSource = dt;
            }
            else
            {
                MessageBox.Show("No");
            }
            private void button2_Click(object sender, EventArgs e)
            {//修改
                var Id = (int)dataGridView1.SelectedRows[0].Cells["Id"].Value;
                var Name = (string)dataGridView1.SelectedRows[0].Cells["Name"].Value;
                var Age = (int)dataGridView1.SelectedRows[0].Cells["Age"].Value;
                var Score = (int)dataGridView1.SelectedRows[0].Cells["Score"].Value;

                Form2 form2 = new Form2(Id, Name, Age, Score);
                var res = Form2.ShowDialog();
                if (res == DialogResult.Yes)
                {
                    var sql = "select * from Students";
                    var dt = DBHelper.GetDataTable(sql);
                    dataGridView1.DataSource = dt;
                }
                else
                {
                    MessageBox.Show("No");
                }
                private void button3_Click(object sender, EventArgs e)
                {
                    if (dataGridView1.Rows.Count > 0)
                    {
                        var Id = (int)dataGridView1.SelectedRows[0].Cells["Id"].Value;
                        var sql = string.Format("delete from Students where Id='{0}'", Id);
                        var res = DBHelper.AddOrUpdateOrDelete(sql);
                        if (res == 1)
                        {
                            MessageBox.Show("删除成功", "温馨提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Information);
                            var stusql = "select * from Students";
                            var dt = DBHelper.GetDataTable(stusql);
                            dataGridView1.DataSource = dt;
                        }
                        else
                        {
                            MessageBox.Show("删除失败", "请重试", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);
                        }
                    }
                    else
                    {
                        MessageBox.Show("请重新选择你要删除的文件", "请重试", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);

                    }

                    private void button4_Click(object sender, EventArgs e)
                    {
                        //查询

                        var name = textBox1.Text;
                        var sql = string.Format("select * from Students where Name like '%{0}%'", name);
                        var dt = DBHelper.GetDataTable(sql);
                        dataGridView1.DataSource = dt;

                    }
            }

        }
    }
    }
}
